Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1984-12-06

1987-01-06

Robinson, Ellis P.

Stock material or miscellaneous articles

Composite

Of polyamidoester

252 625Y, 360134, 360135, 360136, 427128, 427131, 428694, 428900, G11B 572

Patent

active

046346333

ABSTRACT:
A magnetic recording medium has a magnetic layer consisting essentially of a binder and magnetic particles on one surface of a non-magnetic substrate. The thermoplastic polyurethane-urea resin in which unsaturated bonds sensitive to radiation are introduced is used as the binder.
The thermoplastic polyurethane-urea resin in which the radiation-sensitive unsaturated bonds are introduced has both urethane and urea bonds in the molecular structure thereof. It is synthesized from long chain diol with a molecular weight of approximately 500 to 5000, a short chain diol with a molecular weight of approximately 50 to 500, an organic diisocyanate, an organic diamine, and a compound containing radiation-sensitive unsaturated double bonds, and cured by radiation.
The thermoplastic polyurethane-urea resin in which not only the radiation-sensitive double bonds but also hydrophilic polar groups are introduced may also be used as the binder. These hydrophilic polar groups may for example include --SO.sub.3 M, --OSO.sub.3 M, --COOM, and ##STR1##

REFERENCES:
patent: 4328282 (1982-05-01), Lehner
patent: 4328935 (1982-05-01), Steel
patent: 4419406 (1983-12-01), Isobe
patent: 4521486 (1985-06-01), Ninomiya
patent: 4529661 (1985-07-01), Ninomiya
patent: 4567108 (1986-01-01), Lehner
patent: 4567109 (1986-01-01), Lehner
patent: 4568610 (1986-02-01), Lehner
patent: 4568612 (1986-02-01), Lehner

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